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Restructuring Charges (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) employee
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 0	$ 41
Severance and other termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 22
Number of positions eliminated | employee			201
Restructuring reserve			$ 17
Asset impairments
Restructuring Cost and Reserve [Line Items]
Restructuring charges			8
Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 10

X

- Definition

The number of positions eliminated during the period as a result of restructuring activities.

+ References

No definition available.

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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-Publisher FASB
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-Topic 420
-SubTopic 10
-Section S99
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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